sin(110), this can be rewritten as sin(180-70).

Now we know from basic trignometry,

`sin(180-theta) = sin(theta)`

Therefore,

sin(110) = sin(70)

sin(70) can be rewritten as sin(90-20). According to basic trignometry,

`sin(90-theta) =cos(theta)`

Therefore, sin(70) = cos(20), so sin(110) = cos(20)

`cos(360-theta) =cos(theta)`

cos(20) = cos(360-20)

cos(20) = cos(340)

Therefore sin(110) = cos(340)

Three equivalent trig ratios are,

**sin(110) = sin(70) =cos(20) = cos(340)**

## See eNotes Ad-Free

Start your **48-hour free trial** to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Already a member? Log in here.